To get the working build/installer.php:
npm install
node_modules/.bin/grunt build
To actually restore an archive, we need 2 things:
- Built
snapshot-installer.php - Actual backup archive :)
Once you have both, copy them over to a destination directory of your choice
(within your webroot, of course). The installer will expect the backup archive
in the same directory, and named after a Snapshot v4 or Snapshot v3 full backup archive
file convention (i.e. [0-9a-f]{12}\.zip or full_*.zip).